Laboratory-confirmed human cases of H5N1 avian influenza, January 2004 to present

Last updated March 9, 2005

Note: The cases reported below fall into two phases and are thus presented in two separate tables, with a cumulative table following. The first wave of cases occurred from early 2004 through late October 2004. After a 2-month lull, a new wave began occurring in late December 2004 and is ongoing.

The first table (mid-December 2004–present) shows both official World Health Organization (WHO) numbers and unofficial numbers compiled by CIDRAP staff that include the WHO cases plus cases reported as laboratory-confirmed by media sources we consider reliable (CIDRAP monitors numerous US and international news services, newspapers, and Web sites and includes cases only if they are reported by multiple sources). The second table (Jan 28–Oct 25, 2004) gives official WHO numbers reported at the end of the first wave.

Cases Reported in Current Outbreak (Mid-December 2004–Present)
	Official*		Unofficial†
Country	Total Cases	Deaths	Total Cases	Deaths
Cambodia	1‡	1‡	1‡	1‡
Thailand	0	0	0	0
Vietnam	14	10	24	13
Total	15	11	25	14
*Recognized by WHO (calculated from WHO reports of confirmed human cases). †Reported by media sources (includes WHO case count). ‡Patient became ill in Cambodia but died in a Vietnamese hospital.

WHO-Confirmed Cases Reported in Earlier Outbreak (Jan 28–Oct 25, 2004)*
	Total cases	Deaths
Thailand	17	12
Vietnam	28	21
Total	45	33
*See WHO Oct 25, 2004, update); 1 case in Vietnam from Feb 2004 was added retrospectively on Mar 7, 2005, and several others are pending (see WHO Mar 7, 2005, update)..